Salut to Romania. The only sure way to know is with a biopsy. But there are tests that can be taken before that, to see if a biopsy is warranted. Maybe a CBC then a scan such as ultrasound or CT or MRI (in increasing order of expense).
If this all happened very quickly, in 3 weeks, then it's less likely to be lymphoma.
I wouldn't delay in seeing a doc. They'll likely begin by assessing the size, firmness, shape and movability, and also presence or not of pain in the nodes. Those things are indications but can't tell for certain - but that's a start. Good luck to you.
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